R help - Nov 2008 - applying an operation for several dataframes

Dear R community,
    I am trying to apply a simple operation to several dataframes (e.g.
nrow) and cannot get the looping to work. My objective is to get an output
that indicates me the number of rows for every dataframe.
> c
  V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1  1 11 21 31 41 51 61 71 81  91
2  2 12 22 32 42 52 62 72 82  92
3  3 13 23 33 43 53 63 73 83  93
4  4 14 24 34 44 54 64 74 84  94
5  5 15 25 35 45 55 65 75 85  95
> cc
   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1   1 11 21 31 41 51 61 71 81  91
2   2 12 22 32 42 52 62 72 82  92
3   3 13 23 33 43 53 63 73 83  93
4   4 14 24 34 44 54 64 74 84  94
5   5 15 25 35 45 55 65 75 85  95
6   6 16 26 36 46 56 66 76 86  96
7   7 17 27 37 47 57 67 77 87  97
8   8 18 28 38 48 58 68 78 88  98
9   9 19 29 39 49 59 69 79 89  99
10 10 20 30 40 50 60 70 80 90 100
> names<-c("c","cc")
> for(i in names){nrow(i)}
Thank you!
Georg.
*****************************
Georg Ehret
georg@rhone.ch
Geneva University Hospital
Switzerland

	[[alternative HTML version deleted]]

?get

names <- c('c', 'cc')
for (i in names){
    print(nrow(get(i)))
}


On Sat, Nov 22, 2008 at 4:06 PM, Georg Ehret <georgehret at gmail.com>
wrote:
> Dear R community,
>    I am trying to apply a simple operation to several dataframes (e.g.
> nrow) and cannot get the looping to work. My objective is to get an output
> that indicates me the number of rows for every dataframe.
>
>> c
>  V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> 1  1 11 21 31 41 51 61 71 81  91
> 2  2 12 22 32 42 52 62 72 82  92
> 3  3 13 23 33 43 53 63 73 83  93
> 4  4 14 24 34 44 54 64 74 84  94
> 5  5 15 25 35 45 55 65 75 85  95
>> cc
>   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> 1   1 11 21 31 41 51 61 71 81  91
> 2   2 12 22 32 42 52 62 72 82  92
> 3   3 13 23 33 43 53 63 73 83  93
> 4   4 14 24 34 44 54 64 74 84  94
> 5   5 15 25 35 45 55 65 75 85  95
> 6   6 16 26 36 46 56 66 76 86  96
> 7   7 17 27 37 47 57 67 77 87  97
> 8   8 18 28 38 48 58 68 78 88  98
> 9   9 19 29 39 49 59 69 79 89  99
> 10 10 20 30 40 50 60 70 80 90 100
>> names<-c("c","cc")
>> for(i in names){nrow(i)}
>
> Thank you!
> Georg.
> *****************************
> Georg Ehret
> georg at rhone.ch
> Geneva University Hospital
> Switzerland
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?